remarkable rebound in our construction industry. captions by: caption colorado comments@captioncolorado.com >> pelley: tonight answers to the mysteries of the marathon bombing. why did the bombers ambush officer sean collier and where did they get their explosives? we now have new details from bob orr and john miller. and we'll talk to the officers who stopped the terror. >> this is the one chance we had. we wanted to end this for everybody. >> pelley: a phony news report about an attack at the white house since the stock... sends the stock market plunging. major garrett reports and fighting the flood in the midwest. dean reynolds is on the scene. ñiçsx scene. captioning sponsored by cbs this is the "cbs evening news" with scott pelley. with scott pelley. >> pelley: good evening. another difficult day for boston. the city said good-bye to two victims of the terror attacks. there was a private funeral for eight-year-old martin richard

whose childhood innocence we will never forget. sean collier achieved his childhood dream when he became a cop. an army of officers attended his funeral today. we learned why collier was executed as he sat in his patrol car. more about that in just a moment. but first bob orr has information about a shopping trip one of the suspects took to buy explosives. >> reporter: on february 6, ten weeks before the marathon bombings, tamerlan tsarnaev walked into the sea brook new hampshire fireworks store and bought two lock-and-load mortars kits. each kit cost about $200 and contained 24 pyrotechnic shells. investigators now are trying to determine if the brothers used the black powder from those fireworks as the explosive in the pressure cooker bomb. tsarnaev's name was recorded in the store's computer system at the time of the sale.

megan kerns was the clerk. >> i do remember first him having the accent and then him asking for the biggest stuff. i showed him one other product. he definitely stressed he wanted the biggest, loudest stuff. >> reporter: new pictures surfaced today of the early friday morning shootout between the tsarnaev brothers and police in watertown massachusetts. the photos, taken from inside a house overlooking the scene of the gun fight, seemed to show the brothers crouched in front of a mercedes s.u.v. they had car jacked. one of the brothers appears to be holding a gun with both hands in front of his body. a second car belonging to the suspects can also be seen with the passenger side door open. witnesses say during the shootout the brothers seemed to retrieve ammunition and explosives from that vehicle to use in the ongoing battle. tamerlan tsarnaev was killed in the confrontation but his younger brother dzhokhar survived and is now in fair condition in a boston hospital with multiple gunshot wounds. dzhokhar has told interrogators that he and his brother acted alone in planning and carrying out the twin bombings, and the

f.b.i. has found no evidence of conspiracy. he said they had no connections to any terrorist group, but he also has told investigators he and his brother drew inspiration for jihad from radical islamic preachings on the internet. investigators believe the tsarnaevs may have launched the attack in retribution for the killing of muslims by american troops in afghanistan. to confirm a possible motive, investigators now want to interview tamerlan's wife catherine russell. today her attorneys issued a statement saying she is doing everything she can to assist in the ongoing investigation, adding the reports of her husband's involvement in the attack came as an absolute shock to the family. key remaining questions for investigators now involve the bombs. where did the brothers build them? did they ever set off practice explosions? how did they pay for the materials and manage to do all of that under the radar? >> pelley: bob, thanks very much.

another remaining mystery has been why sean collier, a campus police officer at m.i.t. was apparently lured into an ambush and shot to death thursday night. john miller has been talking to his sources. john, the police think they have the answer now. >> reporter: they do, scott. investigators now believe that officer collier was killed because the two bombing suspects wanted to take his gun. tamerlan tsarnaev and his brother dzhokhar only had one real gun and one pellet gun. investigators believe because the officer's holster had a locking system they apparently couldn't get the gun out. officer sean collier was shot in the head execution style while sitting in his patrol car. one of the first responders was officer richard donahue. here he is at the scene of collier's murder, a few hours later he would be seriously wounded in this shootout with the tsarnaev brothers. (gun fire) tamerlan tsarnaev died in the gun battle. the hunt for dzhokhar tsarnaev came to a head the next evening

when a man spotted the 19-year- old hiding under a tarp on his boat in the backyard. four members of the boston transit police swat team -- kenny tran, ryan harer, darrell thompson and jeff campbell -- got the call to apprehend the suspect. >> i saw the suspect sitting up on the, i believe it's called the gunnel of the boat with one leg hanging over the side. his hands were just sort of down by his side. he looked weak. he was shaky. he appeared to be losing consciousness and did have some wounds to his body. you could see the blood on his body. >> reporter: what are you telling him to do? >> we're commanding him to get down off the boat. we don't know if he has a weapon or some type of explosive ignition switch that he could just reach down and hit. we waited to a point where, as we were getting closer to him and both hands came up, we saw that both hands were open, we bolted out in front of the shield at that point. it was the one chance we had and we wanted to end this for

everybody. >> reporter: i'm wondering what it's like when you're in a tactical mode. do you think, i have a suspect, he may have a bomb on him? >> well, your training kicks in, you know. you can't be scared. you just have to do the task at hand. >> reporter: what was it like to be the person who put the handcuffs on probably the most wanted man anywhere? >> at that time you don't think about that. i just put the cuffs on, brought his hand around. somebody else was holding the other hand. these guys are helping me along with other people. we cuffed the other hand and just moved out. >> pelley: john, one of the other things you've learned is there was no gun in the boat. it looks like dzhokhar tsarnaev was not armed in the boat. the police had been in the running gun battles with explosives. i wonder if he wasn't armed in the boat, what started that gun fight at the place. >> reporter: that's a fascinating question because it goes to what they were perceiving, they had one officer had the high ground. he saw the tarp on the boat flip up. he saw the hand come out with an object in it. he didn't think it was a gun.

he thought dzhokhar was about to throw another bomb. he fired a couple of times at dzhokhar. other officers who were just arriving saw the tarp flip up, heard the gun fire and apparently believed it was dzhokhar firing out so they laid down covering fire at that boat until the incident commander said cease-fire and slowed the incident down and said let's put together a plan to get in there and get that guy out of the boat. >> pelley: john, thanks very much. as you've already heard, the bombing suspects immigrated to the u.s. about ten years ago. from a war-torn region of russia. islamic militants in chechnya and dagestan have been fighting russian rule. charlie d'agata is in that region. charlie, you went to visit the tsarnaev brothers' mother today. what happened? >> well, we went to the house this afternoon, scott. nobody was home. we spoke to a family lawyer who said that the mother was on the internet. she came across images of the body of the older son. she became hysterical and wanted to leave the house. the lawyer actually had to protect her from a crowd of

journalists outside as they left. we can confirm that she spoke to russian investigators and the f.b.i. tonight. earlier she spoke to britain's channel 4 news. >> what happened is a terrible thing. but i know that my kids had nothing to do with it. i know it. i am mother. you know, i know my kids. i know my kids. >> reporter: now the family lawyer said that both parents want to return to the united states as soon as they can to find out exactly what happened to their sons. they want to be by their younger son's bedside. >> pelley: charlie d'agata reporting for us in dagastan russia tonight, charlie, thank you. boston officials raised the casualty count in the bombing. its still three people killed but the number of injured is up to 282. apparently some people who suffered things like damaged eardrums are only now coming in for treatment. 42 are still in the hospital, but only one in critical condition. the mayor and the governor

announced today that donations to a fund to help the victims has now reached $20 million. on wall street today, the dow ended with a healthy triple- digit gain, but that was quite a comeback from a triple-digit plunge earlier in the session. after a false report of an attack on the white house. it turns out that hackers put out the report after breaking into the twitter account of the associated press. major garrett is our man at the white house. major, what happened? >> scott, the associated press white house correspondent julie pace set the record straight at the beginning of today's briefing with white house press secretary jay carney. >> it appears as though a.p. twitter account has been hacked. so anything that was just sent out about any incident at the white house is actually false. >> i appreciate that. i can say that the president is fine. i was just with him. >> reporter: at the time in question, the president was in

meetings at the white house. he would appear later at a rose garden event honoring teachers. the hacked tweet read, "breaking: two explosions in the white house and barack obama i#( injured." a group called the syrian electronic army claimed responsibility. but the identity of the a.p. hacker has not been verified. the phony tweet appeared at 1:07 p.m. eastern, and a panic sell- off began on wall street. the dow jones average fell nearly 150 points in two minutes. at 1:12 p.m. the associated press announced it had been hacked. the market regained the losses five minutes later. recently the syrian electronic army claimed it had infiltrated other news organizations, including cbs news program "60 minutes" and "48 hours" as well as national public radio and the bbc. the securities and exchange commission and the f.b.i. are investigating the hack-attack on the associated press. investigators tell us, scott, the syrian electronic army sympathizes with the regime of

assad as it clings to power in damascus. >> pelley: major, thank you. there was a twist into the investigation into letters containing the poison ricin that were mailed to the president and two other politicians. the mississippi man accused of sending them, paul kevin curtis, is off the hook. charges dismissed. he was released from jail today. at a hearing yesterday an f.b.i. agent testified that no ricin was found in curtis' home. today agents searched another mississippi home. no word yet if anything was found there. house republicans fired off a blistering report today criticizing former secretary of state hillary clinton. the issue is the attack last year on the u.s. consulate in benghazi, libya. that attack killed the ambassador and three other americans. no democrats joined in today's report. our congressional correspondent nancy cordes has had a look at it. >> reporter: the congressional report cites a state department

cable from april 2012, five months before the benghazi attacks. the cable acknowledges the u.s. ambassador's request for additional security but instead, according to the report, articulated a plan to scale back security assets for the u.s. mission in libya including the benghazi mission. republicans who viewed the cable say it bears secretary clinton's signature which they claim contradicts this assertion she made in a hearing this january. >> i didn't see those requests. they didn't come to me. i didn't approve them. i didn't deny them. >> reporter: the report also concludes that the administration willfully perpetuated a deliberately misleading and incomplete narrative, editing talking points about the attacks not at the direction of the c.i.a., as the white house has claimed, but to insulate the state department from criticism that has ignored the threat environment in benghazi. the report cites fragments of state department emails expressing concern in the days after the attacks that the

original talking points could apply that they were not paying attention to agency warnings even after changes were made a senior state department official wrote that the edits still did not resolve all my issues or those of my building leadership. two days later after still more changes, those talking points were used by the u.s. ambassador to the u.n., susan rice, on five sunday talk shows. >> we do not have information at present that leads us to conclude that this was premeditated or preplanned. >> reporter: house democrats complained they were cut out of this investigation. we were not able to view the state department emails to confirm that the quotes were accurate or that they were taken out of context. the white house did not issue a flat-out denial, scott, but they did tell cbs news that the report, quote, appears to raise questions that have already been asked and answered in great detail. >> pelley: nancy cordes at the capital. nancy, thank you very much. the airlines today are pleading with the government to end the flight delays.

will the levees hold? we're in the flood zone. and this doctor makes her rounds on the streets of boston. when the cbs evening news continues. continues. with free package pickup from the united states postal service a small jam maker can ship like a big business. just go online to pay, print and have your packages picked up for free. we'll do the rest. ♪

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>> pelley: spring rains are the enemy in the midwest today. flooding threatens farms and towns along the illinois and mississippi rivers. the national weather service told us today that the high water will continue into next

month. dean reynolds is in clarksville, missouri tonight. >> reporter: it was only a few weeks ago that louis bush was worried the rains would never come. >> but that's not today. >> reporter: that's not today. you have too many of them. >> right. >> reporter: nobody is talking about the drought in annada missouri anymore. the mississippi river is now knocking on bush's front door. >> so if this comes over this levy... >> then that little town and everything will be underwater. >> reporter: this part of the midwest has received three times the normal april rainfall. and bush showed us a second levy that bears the consequences. water pouring over the top now threateni('ziá threatening 2500 acres. the town, the railroad, the highway, would all be submerged if the water keeps coming. >> where we're standing here, it would be up to our eyes. that's how deep it would be.

>> reporter: flood warnings have been posted from the great lakes to the gulf of mexico. while in grand rapids, michigan, ducks were swimming at office- window level. in clarksville, missouri, not far from lewis bush's farm volunteers worked hard piling sandbags five to six feet high in a last-ditch bid to hold the mississippi at bay. and these sandbags behind me, scott, will stay in place because the people around here understand that the water in the upper midwest is heading in this direction. and could make for a very difficult month of may. >> pelley: more trouble coming, dean. thank you very much. more flights were delayed again today. at least in part because of the budget stand-off in washington. the delays range from about 25 minutes in dallas to two hours in new york. there are 10% fewer air traffic controllers on duty because of the mandatory budget cuts. today the airlines and members of congress pleaded with the f.a.a. to find other ways to cut

spending. the white house says it's open to new ideas. the gap between the rich and the super rich and everyone else is changing. we'll have that in just a moment. moment. [ jackie ] it's just so frustrating... ♪ the middle of this special moment and i need to run off to the bathroom. ♪ i'm fed up with always having to put my bladder's needs ahead of my daughter. ♪ so today, i'm finally talking to my doctor about overactive bladder symptoms. [ female announcer ] know that gotta go feeling? ask your doctor about prescription toviaz. one toviaz pill a day significantly reduces sudden urges and accidents, for 24 hours.

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to prove to you that aleve is the better choice for him, he's agreed to give it up. that's today? [ male announcer ] we'll be with him all day as he goes back to taking tylenol. i was okay, but after lunch my knee started to hurt again. and now i've got to take more pills. ♪ yup. another pill stop. can i get my aleve back yet? ♪ for my pain, i want my aleve. ♪ [ male announcer ] look for the easy-open red arthritis cap. >> pelley: the news wall street was holding its breath for came after the closing bell today. apple reported earnings fell 18% in the first quarter compared to a year earlier. but that beat expectations and so apple stock rose in after-

hour trading. it's been a rough six months for apple. after topping $700 a share in september, the stock is now down 42%. the very rich got rich eras the nation began to recover from the great recession. everyone else got a little bit poorer. a report today by the pew research center says that between 2009 and 2011 the upper 7% of american households saw their net worth increase by 28%. but the vast majority of americans saw their wealth drop by 4%. one reason for the disparity, the very wealthy are heavily invested in the stock market which rose during that period. the city of los angeles will pay more than $4 million to settle claims by two women who were hurt when police mistakenly opened fire on their pick-up truck during the hunt for ex-cop christopher dorner in february. the women were delivering newspapers.

one was shot in the back. the other was hit by flying glass. dorner went on a killing spree seeking revenge for being fired. he took his own life after police cornered him. a doctor in boston has an unusual specialty. her story is next. next. he barrelful? the carful? how about...by the bowlful? campbell's soups give you nutrition, energy, and can help you keep a healthy weight. campbell's. it's amazing what soup can do. [ sneezing ] she may be muddling through allergies. try zyrtec®. powerful allergy relief for adults and kids six years and older. zyrtec®. love the air. how did i know? well, i didn't really. see, i figured low testosterone would decrease my sex drive... but when i started losing energy and became moody... that's when i had an honest conversation with my doctor.

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past week about doctors, nurses and first responders who worked heroically to save lives at the boston marathon. but we end tonight with a doctor who is saving lives on the streets of boston every night. elaine quijano has her story. >> reporter: it's just after 8 p.m. and roseanna means is working the night shift. >> i have some socks. do you need any socks? >> sure, that would be great. >> reporter: she is a doctor but means is not getting paid for these rounds. she's searching for homeless women on the streets of boston. >> being homeless is a very lonely kind of existence. >> reporter: it all started 20 years ago when the harvard- trained doctor at brigham and women's hospital began volunteering at health clinics for the homeless. >> when i see these women, i see this could be me. it could be you. it could be any one of us, because there's nobody who goes through life without having problems. i mean, i have been through cancer. i lost a child. i've been through a divorce. i have steel knees. i think when you share your own

humanity with the women with everything that you've been through, it makes it more real to them. your pulse is about 60. >> reporter: in 1998, means founded the nonprofit, "women of means". her team of 16 volunteer doctors provides free medical care to women at homeless shelters around the city. they average 10,000 visits a year. >> thank you. >> it's not a system of care. it's a giving of sort of human kindness to people who just need to be acknowledged and validated and appreciated. >> if it wasn't for you, i never would have survived. >> reporter: dr. means doesn't just check on her patients' physical health. their mental and emotional well- being is important to her, too. if you hadn't met dr. means, where do you think you would be today? >> honest to tell you the truth, i'd be done. >> reporter: donna o'connell was a homeless drug addict when she first met dr. means ten years ago. >> we sat down and instantly shy just talked to me and she gave me courage and hope and

you know, she gave me antibiotics. she, you know, evaluated and she told me, and then i ended up just opening up and telling her about my life and she just, like, helped me. >> diamond, you look awesome. >> reporter: now o'connell is sober, off the streets, and working part time. >> she saved me. she saved me. so now when i go to my mom's grave, i say, you know, mom, i love you, and thank you for giving me another mom. you'll always be my mom, but thank you for giving me her. thank you very much. >> love you. >> love you. >> reporter: so means' mission continues searching for ways to help women help themselves. elaine quijano, cbs news, boston. >> everyday heroes on the "cbs evening news" tonight. for all of us at cbs news all around the world, good night. around the world, good night. night. captioning sponsored by cbs media access group at wgbh access.wgbh.org

>> your realtime captioner: linda marie macdonald r elizabeth california is on track to collect 4 billion dollars me good evening, i'm allen martin. >> i'm julie watts. in for elizabeth cook. california is on track to collect $4 billion more in personal income taxes than originally expected. the state's legislative office said today the state has been posting strong tax collections so far this fiscal year. this news means a potential boost to funding for education, much or all of that extra revenue expected to go to public schools and community colleges. >> but it's not all good news. once again, contra costa supervisors are talking about closing fire stations. four have already been shuttered and as kpix 5's cate caugiran says, talk of losing more stations has people nervous. >> the impact is going to be tremendous to this area. >> reporter: a new budget was

put on the table at this morning's board of supervisors meeting and two more contra costa fire stations were put on the chopping block. >> i know they have to cut but i can imagine cutting two more fire stations. it would devastate this area. >> it's our fire season. we had the refinery. they had their own fire department but in case of something where all the stations have to come help, what happens to the people here if something happens? it's a concern. >> reporter: last year, the board decided to close four stations, including six engine companies, after residents failed to pass a $75 a year parcel tax. unfortunately, last year's reality is the same today: there is no money. >> it's very difficult. and we recognize that our citizenry wants fire protection services and we're going to have to figure how we're going to do that. >> reporter: but firefighters say the other reality is, these cuts could be a life-or-death move. >> our firefighter staffing went from 91 firefighters down to 72 and these cuts would